Oil burner



.Alfil 28,A 192s.

' 1 535 575 A. CHISHOLM ET AL 7 oIL BURNER .Patented Apr. 28, 1925.

UNrTEDsTATEs PATENToFF 1,535,575 ICE ALLEN n. cHrsHoLivr AND OIL BURNER.

Application :filed December 29, 1922. Serial No. 609,660.

To @ZZ whom t may concern."

Be it lrnown that we, ALLEN E. Cr-iisrroLM` and SAMUEL MURRAY, citizens ot the United States,residing at Portland, in the county of Multnomah and State of Oregon,

have invented certain new and useful 11n-` provements in Oil Burners` offrwhich the iollowing` is a specification. i

rlhis invention relates to improvements i oil burners, and has particular reference to that type of oil burner in which liquid fuel, such as crude oil or` the like, and `a supporter of combustion, such as steam,or air, or both, are thoroughly mixed within the burner to roduce a highly combustible mixture capab e of generating intense heat upon ignition. j

The object of thisinvention is to provide an oil burner Vin which the liquid fueliis, by 20. impact and capillary attraction, changed v intoan extremely thin sheet of liquid fuel,

. which is then subjected to the atomizing action of steam, whereby the fuel is shattered and finely atomized, and this mixture then more completely utilize the atomizing and exlianding of thefuel oil and steam. A

A further object of the invention is to provide an oil burner in which an auxiliary jet of steam is employed in, connection with a, Venturi tube, whereby the aforesaid mixture of fuel oil and steam is drawn under high velocity from said expansion chamber,

past the sharp edges of a contracted discharge passage, and mixed with suitable quantities of jair to produce a highly combustible mixture.

A, further object 'of the invention is to provide a device ofthe above mentioned character in which .theparts ot the burner `structure are readily detachable so that access maybe hadv to the interior of theburner :tor purposes of cleaning and repair.

A still further object oiithis invention is to provide a device of the above mentioned character that is simple inconstruction, convenient in use, strong and durable, and highly efficient in the purpose for which designed. Y Y v Y In the accompanying drawings, forming a part of the specication, and in which like numerals4 are 1 employed to designate like parts throughout the several views:

Figurel is av vertical 4Vsectional view of our improved burner` and passed into a suitable expansion chamber to Figures 2, 3 and 4 are transverse sectional views on the lines 2 2, 3--3, and 4--4 respectively of Figure l.

Referring to the drawings, wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 represents the oil inlet to the burner and comprises an elbow construction through the vertical passage of which extends the needle-valve stem 6.A Secured to,

this elbow is the oil nozzle 7, provided lnear rthe base of its central passage with a valve seat adapted to coact with the valve stem 6 to regulate the amount of oil fed to the burner. Connected to the nozzle 7 is the expansion and vaporizing bowl, comprising the lower cup-shaped section 8, and the upper' dome-like section 9, detachably connected to the section 8 by suitable bolts 10. V4The member 8 is provided near its base with steam` inlet 11 and is constructed to form an annular opening 12 concentric with the oil nozzle 7. Attached to the upper section 9 of the bowl, and supported by the spider 13 is a deflector plug 14, having a lower concaved surface 15, against which the oil from nozzle V7 impinges. The rim of .this concaved surface 15 flares outwardly, as indicated at 16, and then flares inwardly to 4orm the contracted portion 17, slightlyV spacedV f from the correspondingly shaped wall 18 of the upper bowl member 9, to forma sharp vedged contracted discharge passage 19.

Secured to the upper open end of the expansion and vaporizing bowl and preferably at right angles to the salue is the mixing tube 20, provided at one of its ends with the steam injector `nozzle 21, and near its opposite end` with primary airA inlet openings 22, radially arranged in series about the tube. Positioned within the tube at a point 'in rear of the openings 22, is the inwardly tapering cone 23 of a Venturi tube.

Secured tothe outer endjoiiv Ithe saidmixing tube 2() is the outwardly tapered-cone 24 of the Venturi tube, the inner end of said cone 'being slightly spaced from the discharge end oi. the cone 23 to provide means of communication with lthe primary air openings 22 above referred to. The outer member 24 of the Venturitube is further provided with auxiliary airinlet openings 25 arranged radially through the walls of the same.

It is thus obvious from the above detailed.

description` of construction and' assembly,

ico

tube communicating with said bowl into which the atomized vapor drawn through the sharp-edged annular discharge opening is subjected to the action of an auxiliary jetof steam to more completely atomize the vapor and to forcibly eject the same from the burner, a Venturi tube through which the vapor is projected and provided with air openings adjacent the throat for admitting air tothe atomized vapor.

5. An oil burner comprising an expansion and vaporizing chamber wherein fuel oil is atomized, a 'mixing tube communicating with said chamber in which the atomized vapor it subjected to the action of an auxiliary jet of steam to more completely atomize the vapor and to forcibly eject the same from the burner, a Venturi tube through which the vapor is projected and provided with air openings adjacent the throat for admitting air to the atomized vapor.

6. An oil burner comprising an expansion and vaporizing chamber in which fuel oil is atomized, a Venturi tube communicating with said chamber, and means for drawing the atomized vapor from said chamber and forcibly ejecting the same through said Venturi tube, said Venturi tube being provided with air openings adjacent the throat for admitting air to the atomized vapor.

'7. An oil burner comprising an expansion and vapoiizing chamber in which fuel oil is atomized, a Venturi tube communicating with said chamber; means for drawing the atomized vapor from said chamber and forcibly ejecting the same through said Venturi tube, and means for supplying a suj'iporter of combustion at the throat of said venturi to said atomized vapor as it passes through said Venturi tube.

S. An oil burner comprising a chamber iu which fuel oil is atomized; a Venturi tube communicating with said chamber, said tube having air inlet openings through the wall thereof adjacent the throat of said venturi; and means for drawing the atomized vapors from said chamber and forcing the same through said tube, whereby the atomized vapor is supplied with air.

9. An oil burner comprising a chamber in which fuel oil is atomized; a Venturi tube communicating with said chamber, said tube having a primary air inletvopening near the throat thereof and an auxiliary air inlet opening beyond said primary inlet; and means for drawing the atomized vapor from said chamber and forcing the same through said tube, whereby air is drawn through said inlet openings and thoroughly mixed with the atomized vapor to produce a highly combustible mixture.

l0. An oil burner comprising a chamber in which fuel oil is atomized; a two-part Venturi tube communicating with said chamber and comprising an inner and outer cone, the two-part tube being provided with openings to form annular air inlet openings at the throat of thev tube; and means for drawing the atomized vapor from said chamber and Vforcing the same through said tube, whereby air is drawn through said an nular openings and mixed with the atom ized vapor to produce a highly combustible mixture. i

11. In an oil burner the combination of a casing, an oil inlet to said casing, an abutment within the casing to intercept the flow of oil and spread the same, an annular steam inlet to said easing arranged concentric to said oil inlet for directing the steam toward and into the oil subsequent to its contact with said abutment, a Venturi tube provided with openings adjacent the throat thereof, andl means con'imunicating with said casing for drawing the atomized mixture from said casing and mixing said atomized mixture with suitable quantities of air from the openings adjacent the throat to produce a highly combustible mixture.

In testimony whereof we hereunto a'fiix our signatures.

ALLEN E. GHISHOLM. SAMUEL MURRAY. 

